30 Fresh and High Quality Twitter Icon Sets | Icons
http://www.hongkiat.com/blog/30-fresh-and-high-quality-twitter-icon-sets/
More really cool Twitter icons ... get them hereFreebie Release: Quartz Icon Set | Freebies | Smashing Magazine
pewnie już było, ale ..zestawy gotowych icon do webdesignuIcones.pro, la plus grande collection d'images PNG et d'icônes
La plus grande collection d'images PNG et d'icônes
L'ultime moteur de recherche pour trouver une image PNG transparente ou une icône parmi plus de 20 000 images référencées.Twitter Fever: 55 Extraordinary Twitter Button & Icon Sets | Onextrapixel - Showcasing Web Treats Without Hitch
Yet more Twitter birds & icons
because you can never have enough bird icons?Super Cool Free Icon Sets | Abduzeedo | Graphic Design Inspiration and Photoshop Tutorials
There are 108 simple icons included in this set. The icons are avaliable in 32x32 px .png (transparent background) format.50 Beautiful Free Icon Sets For Your Next Design - Smashing Magazine
DOT Pictograms
provide our readers with aBoolean: The Pixel Icon City by ~PraX-08 on deviantART
great icon set
Good basic web/UI set.The Best Icon Sets for Portfolio Sites - DesignM.ag Web Design Blog
PixeloPhilia2
44 free PNG icons that could be a perfect fit for a Web or user interface design in an online or desktop application. The set contains both general icons (address book, map, mail, download, target) and rather obscure ones (comic book, license, mug, USB), all in a resolution of 32×32 pixels.